That's also why the full images from JunoCam, the probe's visible-light camera, take the shape of an apple core.

A few things caught the eye of Glenn Orton, who studies the atmospheres and clouds of the solar system's outer planets.

An amateur turned JunoCam's photos into this 3D illustration, and though Orton wasn't sure how the image was made, he said it captures the storm's dome-like shape. "Generally the Great Red Spot is much higher than any other cloud systems around it," Orton said.

"If you take a dome and flatten it a little bit, and put a smaller dome in the middle, that's the shape of [the Great Red Spot]," Orton added. He said you should also "surround it with a moat" to account for a groove the storm cuts into the surrounding cloud cover.

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This image is Orton's favorite: It shows the Great Red Spot in more detail than we've ever seen.

One thing the photo clearly shows is the deep red color of the storm's central core. "It's almost static, like the eye of a hurricane," Orton said.

The storm's ruddy red hue is like a kind of planetary sunburn, since it's caused by ultraviolet light.

"In the lab, when ammonia gas and hydrocarbons contact, they created this reddish polymer," Orton said of a recent NASA-JPL experiment involving two prominent gases in Jupiter's atmosphere. "The longer they stayed in contact, the redder it got."

This is why Orton and other scientists think the core's lack of motion makes it so much redder.

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At the edge of the storm's core, Orton also noticed something familiar: "Those white flecks? Those are white, puffy clouds," he said.

Other researchers were floored by how different the storm looks from the previous images of it.

An approximately true-color image of Jupiter's Great Red Spot, as seen by NASA's Galileo probe on June 26, 1996.NASA/JPL/Cornell University

"Wow, it has changed from the Galileo close-up images [taken] 20 years ago!" Amy Simon of NASA's Goddard Spaceflight Center, told National Geographic. "Lots of interesting details for us to compare between the two."

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The Great Red Spot wasn't the only object Juno snared during its flyby. Orton also pointed out this image of what's called the "North North Temperate Zone Little Red Spot" (a comical name, since it's about as big as Earth).

"This ~8000km diameter storm has been present on Jupiter since the mid-late 1990s and this is by FAR the clearest ever view of it," Damian Peach, an astrophotographer in the UK, wrote in a Facebook post. "This storm has periodically turned red at times through its life."

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These photos are just a fraction of the data Juno is recording, since its visible-light camera — JunoCam — is one of eight different instruments on the probe. The others are currently monitoring auroras, internal structures, magnetic fields, radiation levels, and more.

An illustration of NASA's Juno spacecraft flying through the radiation belts of Jupiter.NASA/JPL-Caltech

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Juno won't fly forever, though. NASA plans to plunge the spacecraft into Jupiter's clouds in 2018 or 2019. This will prevent the probe from spreading any bacteria from Earth to the gas giant's icy, ocean-filled moons like Europa and Ganymede.